[RFC PATCH 2/2] grep: refactor and simplify PCRE1 support

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

The code used both a macro and a variable to keep track if JIT
support was desired and relied on the fact that a non JIT
enabled library will ignore a request for JIT compilation
(as defined by the second parameter of the call to pcre_study)

Cleanup the multiple levels of macros used and call pcre_study
with the right parameter after JIT support has been confirmed
and unless it was requested to be disabled with NO_LIBPCRE1_JIT

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
 grep.c | 15 +++++++++------
 grep.h |  9 ---------
 2 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/grep.c b/grep.c
index 6b52fed53a..599765c5c1 100644
--- a/grep.c
+++ b/grep.c
@@ -386,6 +386,7 @@ static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
 	const char *error;
 	int erroffset;
 	int options = PCRE_MULTILINE;
+	int study_options = 0;
 
 	if (opt->ignore_case) {
 		if (has_non_ascii(p->pattern))
@@ -400,13 +401,15 @@ static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
 	if (!p->pcre1_regexp)
 		compile_regexp_failed(p, error);
 
-	p->pcre1_extra_info = pcre_study(p->pcre1_regexp, GIT_PCRE_STUDY_JIT_COMPILE, &error);
-	if (!p->pcre1_extra_info && error)
-		die("%s", error);
-
-#ifdef GIT_PCRE1_USE_JIT
+#if defined(PCRE_CONFIG_JIT) && !defined(NO_LIBPCRE1_JIT)
 	pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
+	if (p->pcre1_jit_on)
+		study_options = PCRE_STUDY_JIT_COMPILE;
 #endif
+
+	p->pcre1_extra_info = pcre_study(p->pcre1_regexp, study_options, &error);
+	if (!p->pcre1_extra_info && error)
+		die("%s", error);
 }
 
 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
@@ -435,7 +438,7 @@ static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
 static void free_pcre1_regexp(struct grep_pat *p)
 {
 	pcre_free(p->pcre1_regexp);
-#ifdef GIT_PCRE1_USE_JIT
+#ifdef PCRE_CONFIG_JIT
 	if (p->pcre1_jit_on)
 		pcre_free_study(p->pcre1_extra_info);
 	else
diff --git a/grep.h b/grep.h
index 2a74e28d94..30f2503121 100644
--- a/grep.h
+++ b/grep.h
@@ -3,15 +3,6 @@
 #include "color.h"
 #ifdef USE_LIBPCRE1
 #include <pcre.h>
-#ifndef NO_LIBPCRE1_JIT
-#ifdef PCRE_CONFIG_JIT
-#define GIT_PCRE1_USE_JIT
-#define GIT_PCRE_STUDY_JIT_COMPILE PCRE_STUDY_JIT_COMPILE
-#endif
-#endif
-#ifndef GIT_PCRE_STUDY_JIT_COMPILE
-#define GIT_PCRE_STUDY_JIT_COMPILE 0
-#endif
 #else
 typedef int pcre;
 typedef int pcre_extra;
-- 
2.22.0